Single Check and Benefit Deductions

We are implementing single check and we came across a scenario that we think there is config for, but we can't find any information on it.

Scenario:

Empl rcd 0 - Not benefit primary, has hours being paid

Empl rcd 1 - Is benefit primary; has no hours being paid

Benefit deductions are not coming out of the check. We've checked all of the normal culprits (subsets, overrides, arrears, enrollments, etc.) and none of those seem to be the issue.

Does anyone know if we are potentially missing a piece of configuration to ensure that despite where the benefit primary job is, if there is enough money on the check that benefit deductions will take on the check?